Compressor controlling mechanism



ec. 1, 1931. L. J. CLAPP COMPRESSOR CONTROLLING MECHANISM Filed March28, 1950 2 Sheets-Sheet l ln'wmron:

LEW/5 d CLHPP.

Dec. -1, 1931. L. J. CbAPP COMPRESSOR CONTROLLING MECHANISM 2'Sheets-Sheet 2 Filed March 28, 1930 llL/f/ll/ l/YVE/YTOR LEW/5 d. CLHPP.

M A'Wm Patented Dec. 1, 1931 i i I UNITED, STATES PATENT. OFFICE LEWISJ. CLAPP, O]? ULABEMONT, NEW HAMPSHIR ASSIGNOR TO SULLIVAN MAGEIKEBYCOMPANY, A CORPORATION OF MZASSAOEUSETTS oon'rrmssoa CONTROLLING mncmrsmApplication filed larch as, 1930. Serial No. 4391598.

This invention relates to means for coninvention may assume in practice.In the trolling prime movers and compressors or drawings,- pumpingequipment and relates more par- Fig. 1 is a side elevation of a portablecomticularly to an improved combination for pressor embodying myimproved arrangecontrolling the loading or unloading of a ment. 55compressor and also controlling the prime Fig. 2 is an enlargedfragmentary side mover which actuates the compressor. elevation of theprime mover and control Various systems and arrangements have elementsassociated therewith.

heretofore been proposed for effecting co- 3 is an enlarged sectionalview of the 1o ordinated control of the prime mover, such controllingmechanism adapted to cooperate w as an internal combustion engine, and acom- Wi h the-throttle valve of the prime mover pressor driven thereby,but such systems and nd to be actuated by the pressure fluid inarrangements have certain objections either the receiver. in beingcomplicated or lacking stability in g- 1 an nl rged fragmen ary section15 eifecting control, or in being relatively eXpenof the right end ofthe prime mover speed sive to manufacture and maintain, other g vrnordifiio ltie l b i t, as i d Fig. 5 is an enlarged sectional view ofthe st od to th kill i th t, valve mechanism of the controlling mecha-An object of my invention is to provide an mSIn shown 1n Fig. 3.- 2oimproved arrangement for effecting coordig- 6 1S enlarged gm n ySectlOIl nated control between the prime mover and 0f the ng ne throttlevalve and operating the compressor. A further object is to provide animproved arrangement for controliwhlle I h ve hown the lllustrativeemling th Speed f th prime mover d f bodiment of the invent on nconnection with 25 eflecting loading or unloading of the compo ablecompressor, 1t yvlll of coursebeunr A th bj t i t id an i derstood thatthe invention is applicable to proved simplified arrangement forcontroly p une m v rmpressor arrangement ling the speed of an internalcombustion enlrrespcctlve 0f he manner in which it may gine and forcontrolling the loading and/or he'supported. In any case, there is aprime so unloading of the compressor. A further mover, generallymdlcated at he pre so and more specific object of the invention is ablyof the internal combustion engine to provide an improved arrangement andyp Compressor swtably connected means h b th Speed f th prime move! fordrive to the crank shaft of the engine,

may b t ll d i d d tl f th 7 and of the reciprocating piston andcylinder 5 loading mechanism when the compressor is yp y g 1151131 Inletand exhaust V v in its loaded condition. Another specific meChan1mS- r rbly he inlet Valve object of the invehtion is to provide an immechamsm?are Provlded y proved arrangement and means which will be form of 9Punloadm mechalllsm,

relatively simple yet will have a high degree generally Indicated at a nE Pl' to of stability of control and may be easily ig iggi iz z igg ffigz gg g ifi i 1 vs e.

mammmed m operatlon and W111 be lelatlve' Fluid from the receiver isconducted through ly inexpensive .to manufacture. Other oba R 5 to anyusual type of pilot Va1vemech anism 6, and then to a pipe 7 leading toone jects and advantages of my improved inven- 45 non W111 be readllyunderstood by those end of a control mechanism, generally indi- Skilledin the art and l be l y cated at 8. This mechanism is adapted todelstood from P follolf'lng descl'lptlon and control the engine throttlevalve 9 in a manthe accompanying drawlngs. nerwhich is well'understoodin the art, its In these draw ngs I have shown for purspecific formbeing disclosed in the Holds- 5o poses of illustratlon one embodimentthat my worth Patents 1,692,267 and 1,785,956. In 109 v the movablevalve tion is accomplished, $fl0W equalized on each side of the cratinglink 21 view -of these disclosures, a -.deta'iled :description of thevalve mechanism will not begiven, I

a U-shaped pipe 14130 a valve mechanism,

generally indicated at '15, thereby to force 16 open and permit pressurefluid to fiow through a pipe 17 to the unloading mechanisms 3 andthereby unload the compressor. When the unloading functhrough pipe 17cease thus permitting pressure to be valve '16 whereclose this valvewill upon a spring 18 will then to cause the stem inder for piston 10.en receiver pres sure drops to a predetermined minimum and the pilotvalve vents the ipe 7, a spring 20 will move piston 10 to the right andabut against and move the stem 19 and valve 16 to open position, therebylikewise venting the pipe 17 and unloading mechanisms 3 through thepipes 14 and 7, thus causing the compressor to be reloaded. From this itwill be clear that the devices 3 to effect unloading will not occuruntil thenose 12 has ceased to hold the lever 13 in the position towhich it moved it when airacted on piston 10.

As shown in Fig. i2,the nose12ofthe controlling mechanism merely abutsagainst the throttle valve lever of the prime mover and is insubstantially 'pposed relation to an opwhich is pivotally connected atone end to the throttle lever 13and'at its other end to a speed governoroperating lever 22 which is its full open position in Fig. is speedgovernor, for operating lever 22, is of a usual and well-known type,driven preferably, and as herein shown, directly by the usual timinggears for the engine valve mechanism, which timing gears are containedwithin the usual gear case 24. The governor is of the centrifugallyactuated type having a stem 25 movable to the right (Fig. 4) upon anincrease in speed and in the opposite direction upon a decrease inspeed, there being at lever 26 herein held in abutting engagement wisesecured. While with the rod. 25 as by an adjustable sp'riiig pressed rod27. The lever 26 is pinned to the pivotal shaft 28 to which the lever 22is likea compression spring 29 is shown it'will of course be understoodthat any spring arrangement may be employed which will hold the lever 26in en gagement with the speed responslve pin 25.

From the foregoing description of the compressor prime mover controllingmechanism 8 and the description of -the sp ee d responsive governormechanism 23 it will be .19 to project into the cylyetthespeedgovernorandcontrolling mechventing of the air that acts indevice sopera'te directreadily: seen that :both y upon the singlethrottle valve which conjtrols the supply Of fuel from :a .usualcarburetor to the en ineicylindersandthuscon- :trols the speed ci theengine in theusual and well-known manner, and, due :to the springarrangement for holding the levers 26 and 22, the .fluid actuated:control mechanism 8 is adapted to move-theithrot'tle "valveautomatircally :1n accordance with the receiver pressure so'as-to unloadthe'co'mpressor and conatI'Ol the speed -:of the engine without in anyway encountering .any opposing force from the speed responsive elementof the speed governor such as may becreated :by thecentrifugal forcetherein. It is :also seen as previously pointed out that the .speed gov-.ernor may close the throttle valve independently of the controllingmechanism 8 and anismszare adapted to be maintained simultaneously incooperating relation with the single throttle valve during normaloperation.

It is-thus seen that my arrangement is relatively simpleboth instructure and o eration, requlring relatively 'few parts an only asingle engine throttle valve, and While the various controls are shownas applied to a throttle valve of an internal combustion engine, it willof course be understood that this throttle valve comprises broadly apower medium control for a prime mover which may be of any usual formfor driving pumping mechanisms such as compressors.

While there is in this application specifically described one form whichthe invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of theappended claims.

I claim as new and desire to secure by Letters Patent is:

1. The combination with a compressor and a prime mover for driving thesame, of means for controlling the prime mover including a power mediumcontrol element therefor, means for controlling said element inaccordance with the speed of the prime mover, and means governed by thecompressor discharge pressure for controlling said element directly toslow down said prime mover when the compre's'sor'discharge pressureexceeds a predetermined desired maximum, each of'said means havingoperative connection with the element whereby their respective operatingforces are applied to the element substantially in a common plane.

2. The combination with a prime mover operated compressor, of a-powermedium control element forsaid prime mover, a pivoted member foractuating 'said element, means operatively connected to said member forcontrolling said element in accordance with the prime mover speed, andmeans also separately operatively connected, to said member forcontrolling said element in accordance with the compressor dischargepressure, the operative connection of each of said means with saidpivoted member being on the same side of its pivot.

3. The combination in a prime mover operated compressor -comprising apower medium control element, means for controlling said element inaccordance with the speed of said prime mover includin a yieldably heldmember normally moved in accordance with the prime mover speed, saidmember being operatively connected to said power control element, andmeans for also controlling said element in accordance with an operatingcondition of said compressor and adapted upon operation to causedirectly yielding of said speed responsive member. 4. The combination ofa prime mover operated compressor, com rism a ower medium controlelement or said prime mover, means for controlling said power element inaccordance with the speed of the prime mover, and means for alsocontrolling said power element in accordance with an operating conditionof said compressor, each of said means having an operatlve connectionwith said power element operative directly to reduce the flow of powermedium to the prime mover.

5. The combination set forth in claim 4: further characterized in thatoperative connection between the power medium control element and speedresponsive means is positively connected to the power medium controlelement.

6. The combination-set forth in claim 4 further characterized in thatthe operative connection between the power medium control element andspeed responsive means has provision for moving the power medlum controlelement in opposite directions.

7. The combination in a compressor driven an internal combustion enginehaving a pivoted throttle valve and an operating lever therefor,comprising means for controlhn said valve in accordance with the speed 9said engine, and means for controlling said valve by fluid pressure,each of said means having an operative connection with said valve leverand at least one of said connections being adapted to eifect movement ofthe lever in opposite directions.

8. The combination with a compressor driven by an internal combustionengine having a pivoted power medium control valve and an operatinglever, of means for controlling said valve in accordance with the speedof said engine, and means for controlling said valve by fluid pressure,each of said means having an operative connection with said valve levere same side of the pivot thereof and :vhen effective moving it in thesame direcion.

Q. In combination, a compressor having fluid pressure operated unloadingmechanism, an internal combustion engine for driving said compressor, areceiver into which the compressor discharges, means including a pilotvalve for controlling the loading or unloadm of said compressor inaccordance with t 0 receiver pressure, means for controlllng the speedof said prime mover in accordance wit operation with themeans forcontrolling the loading of the com ressor, said speed control includinga ylelda 1e connection adapted at least an er certain conditions ofoperation to yield under the influence of the compressor controllingmechanism.

l0. In combination a compressor having fluid pressure operated unloadmgmechanism, an internal combustion engine for driving .said compressor, areceiver into which the compressor discharges, means including a pilotvalve for controlling the loading or unloading of said compressor inaccordance with the receiver pressure, a throttle valve for controllingthe flow of power medium to said engine, means whereby said com ressorload controlling means is operative y connected to said valve foreffecting closure thereof at a time when the compressor is unloaded, ands ed responsive means for also controlling sai valve in accordance withthe s eedof said prime mover including a yielda le connection betweenthe throttle valve and speed responsive means.

In testimony whereof I afiix my signature.

LEWIS J. CLAPP.

the speed thereof and in 00-

